Παράθεση:
Αρχική Δημοσίευση από Maverick
Πιθανολογείται (δε γνωρίζω αν έχει αποδειχθεί επιστημονικά) ότι τα μικρά εκκρίνουν ουσίες που καθυστερούν την ανάπτυξη, με αποτέλεσμα τα ήδη μικρά σε μέγεθος να μένουν αρκετα πίσω. Γι'αυτό πολλοί εκτροφείς κάνουν συχνές και μεγάλες αλλαγές νερού ώστε να μειώνεται η συγκέντρωση αυτών των ουσιών και να μην υπάρχουν δραματικές διαφορές στα μεγέθη των μικρών. Θα κοιτάξω να δω αν υπάρχει κάποια μελέτη πάνω σε αυτό...
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Water
This is the one I feel is the most paramount in importance - water quality. Most new breeders do not change the water nearly as often as they should to maximize fry growth. A common reason for this is that many conscientious breeders only feel it is necessary to change the water once or twice a week, enough to maintain healthy ammonia and nitrate/nitrite levels in the growout tank. While this is commendable and goes a long way towards making sure your betta fry remain healthy, twice a week water changes are not sufficient for coaxing the best growth out of your fry.
The explanations for this are far from simple.
Scientific studies have proven that most fish, including bettas, excrete a hormone that acts as an inhibitor to growth. In the betta community it has widely been said that this growth hormone stifles the potential of smaller fish in the spawn, giving the advantage to the larger, healthier fry. While this goes a long way to explaining the sometimes dramatic size differences between fry from the same spawn, it is my personal belief based on what I have read that this hormone actually works to limit the growth of the fish so that it does not outgrow its environment. In nature this would be a handy tool, ensuring that there is enough space and resources for all. In the spawn tank, it's just inconvenient. A couple of hundred young fish in a ten gallon tank will soon produce enough hormone to severely limit growth unless the water is changed, and changed often. I change the water in my growout tanks at least 50% every single day. Other successful breeders have reported changing as much as 80-100% per day, with excellent results.
http://www.bettysplendens.com/power-...-your-fry.html